docs: keyword vuepress change vitepress (#267)

* keyword vuepress change vitepress

* docs: modify README.md to index.md

* Optimize code

* Restore highlight.ts

Co-authored-by: Anthony Fu <anthonyfu117@hotmail.com>

docs/guide/markdown.md

@@ -28,9 +28,9 @@ For example, given the following directory structure:
 And providing you are in `foo/one.md`:
 
 ```md
-[Home](/) <!-- sends the user to the root README.md -->
+[Home](/) <!-- sends the user to the root index.md -->
 [foo](/foo/) <!-- sends the user to index.html of directory foo -->
-[foo heading](./#heading) <!-- anchors user to a heading in the foo README file -->
+[foo heading](./#heading) <!-- anchors user to a heading in the foo index file -->
 [bar - three](../bar/three) <!-- you can omit extention -->
 [bar - three](../bar/three.md) <!-- you can append .md -->
 [bar - four](../bar/four.html) <!-- or you can append .html -->

package.json

@@ -54,7 +54,7 @@
   "keywords": [
     "vite",
     "vue",
-    "vuepress"
+    "vitepress"
   ],
   "author": "Evan You",
   "license": "MIT",